77670-30-5Relevant academic research and scientific papers
Novel and versatile solid superbases derived from magnesium-zirconium composite oxide and their catalytic applications
Zhao, Jin,Xie, Jun,Au, Chak-Tong,Yin, Shuang-Feng
, p. 6159 - 6164 (2014)
Versatile solid superbases were derived from magnesium-zirconium composite oxide and KOH through thermal treatment in a N2 flow. The magnesium-zirconium composite oxide was prepared by a modified co-precipitation technique with reflux-digestion in basic solution and then mixed with KOH through grinding. The as-prepared solid superbases were characterized by low-temperature N2 physisorption, powder X-ray diffraction, and Fourier transformation infrared spectrophotometry. The superbasic sites were characterized by the use of Hammett indicators and CO2 temperature-programmed desorption methods. We found that there are ample superbasic sites (0.590 mmol g-1) on the surface with strength in the 26.5 ≤ H- 33.0 range. The as-prepared solid superbase catalyst was found to show excellent catalytic activity towards Knoevenagel condensation, Michael addition and transesterification reactions. The findings open up a new route for the synthesis of new functional superbases using composite oxides prepared by reflux-digestion in basic solution as supports.
Exploring bis-(amino)cyclopropenylidene as a non-covalent Br?nsted base catalyst in conjugate addition reactions
Singh, Gurdeep,Goswami, Prithwish,Vijaya Anand, Ramasamy
supporting information, p. 384 - 388 (2018/02/06)
Bis-(amino)cyclopropenylidene has been utilised as a non-covalent Br?nsted base catalyst in the 1,6-conjugate addition of carbon nucleophiles to p-QMs. This protocol makes it possible to access unsymmetrical diaryl- and triarylmethanes in good to excellen
Synergistic NaBH4Reduction/Cyclization of 2-Aroylcyclopropane-1-carboxylates: Synthesis of 3-Oxabicyclo[3.1.0]hexane Derivatives
Liu, Jiaming,Wang, Lizhong,Qing, Xushun,Zhang, Feixiang,Wang, Ting,Wang, Cunde
supporting information, p. 1012 - 1018 (2017/02/15)
An NaBH4reduction/cyclization reaction of readily available 2-aroyl-1-cyano-3-arylcyclopropane-1-carboxylate compounds was investigated. The process results in the stereoselective synthesis of 3-oxabicyclo[3.1.0]hexane derivatives in high yield
On-water magnetic NiFe2O4 nanoparticle-catalyzed Michael additions of active methylene compounds, aromatic/aliphatic amines, alcohols and thiols to conjugated alkenes
Payra, Soumen,Saha, Arijit,Banerjee, Subhash
, p. 95951 - 95956 (2016/10/25)
Here, we have demonstrated the Michael addition of active methylene compounds, aromatic/aliphatic amines, thiols and alcohols to conjugated alkenes using magnetic nano-NiFe2O4 as reusable catalyst in water. Nano-NiFe2O4 efficiently catalyzed the formation of C-C and C-X (X = N, S, O etc.) bond through 1,4-addition reactions.
Hypoiodite-catalysed oxidative cyclisation of Michael adducts of chalcones with 1,3-dicarbonyl compounds: A facile and versatile approach to substituted furans and cyclopropanes
Gao, Wen-Chao,Hu, Fei,Tian, Jun,Li, Xing,Wei, Wen-Long,Chang, Hong-Hong
supporting information, p. 13097 - 13100 (2016/11/09)
Through hypoiodite catalysis, oxidative cyclisation of Michael adducts of chalcones with 1,3-dicarbonyl compounds for divergent synthesis of either furans or cyclopropanes is developed. The selective synthesis of major products is achieved depending on the use of different reaction conditions or substrates.
Highly enantioselective Michael addition of diethyl malonate to chalcones catalyzed by cinchona alkaloids-derivatived bifunctional tertiary amine-thioureas bearing multiple hydrogen-bonding donors
Liu, Yulong,Wang, Xie,Wang, Xiaoyun,He, Wei
supporting information, p. 3163 - 3166 (2014/05/06)
Chalcones are still challenge substrates in Michael reactions, and only limited success has been achieved. This work describes a highly enantioselective Michael addition of diethyl malonate with chalcones catalyzed by cinchona alkaloids-derivatived bifunctional tertiary amine-thioureas bearing multiple hydrogen-bonding donors.
Imidazolium-based chiral ionic liquids: Synthesis and application
Suzuki, Yumiko,Wakatsuki, Junichiro,Tsubaki, Mariko,Sato, Masayuki
, p. 9690 - 9700 (2013/10/22)
Synthesis of chiral ionic liquids containing an imidazole nucleus and chiral centers on N-substituents is reported. [(2S,3S)-2,3-Dihydroxybutane-1,4- bis(3-butylimidazolium)]-[bis(trifluoromethanesulfonyl)amide]2 and [(4S,5S)-2-phenyl-1,3-dioxo
Rapid synthesis of substituted pyrrolines and pyrrolidines by nucleophilic ring closure at activated oximes
Chandan, Nandkishor,Thompson, Amber L.,Moloney, Mark G.
supporting information, p. 7863 - 7868 (2013/07/05)
Substituted pyrrolines are available by ring closure initiated by direct nucleophilic attack of stabilized enolates at the nitrogen of oximes activated with a leaving group, in a process which effectively out-competes the more usual Beckmann rearrangement. Subsequent reduction provides diastereoselective access to the corresponding pyrrolidines. This provides a rapid route to saturated heterocyclic systems from readily available precursors.
CATALYST AND REACTION PROCESS
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Page/Page column 4; 12, (2011/04/14)
Disclosed is a technology for enabling an efficient asymmetric Michael addition reaction which does not require a large amount of a malonic ester, while having a short reaction time. Specifically disclosed is a catalyst which is composed of MX2 /sup
Phase-transfer catalyzed Michael addition reaction using a new C 2-symmetric quaternary ammonium salt derived from l-proline
Su, Ce,Xie, Yi-Ming,Zhang, Qing-Tang
experimental part, p. 1004 - 1008 (2012/06/16)
A new C2-symmetric quaternary ammonium salt easily prepared from l-proline, was developed and used as an efficient phase-transfer catalyst (PTC) in Michael addition reaction of various active methylene compounds to aromatic enones. Malonate est
